Two mahogany bearing pillar shims and one mahogany engine bed shim, from working model of engines of S.S. 'Harbinger'

Two mahogany bearing pillar shims and one mahogany engine bed shim, from working model, scale 1:12, of the diagonal direct-acting type engines of the S.S. 'Harbinger' (1851), on a mahogany hull base, by Maudslay Sons and Field, Lambeth, London, England, 1851-1852